﻿#include  <stdio.h>
main()
{	 	  			 
	double term, result = 1;
	int n;
	for (n=2; n<=100; n=n+2)
	{	 	  			 
		term = (double)( n * n)/(( n - 1) * ( n + 1));
		result = result * term;
	}
	printf("result=%f\n", 2*result);
}	 	  			 